Mold for resin molded part and method of manufacturing resin molded part
AssigneeKoito Manufacturing Co., Ltd.
InventorTakeyuki Tachiiwa
Life of this patent
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Abstract
Provided is a mold for a resin molded part which defines a cavity with a plurality of submolds. The plurality of submolds includes a gate submold including a gate formed therein to inject a molten resin into the cavity; a gas injection submold including a gas injection port formed therein to inject a gas into the cavity; and a core pin submold including a core pin provided to be movable in a retreat direction from the cavity. The core pin submold is arranged such that the core pin faces the gas injection port.
Claims9
A mold for a resin molded part which defines a cavity with a plurality of submolds, wherein the plurality of submolds includes:
- a gate submold including a gate formed therein to inject a molten resin into the cavity;
- a gas injection submold including a gas injection port formed therein to inject a gas into the cavity;
- and
- a core pin submold including a core pin provided to be movable in a retreat direction from the cavity, and
- the core pin submold is arranged such that the core pin faces the gas injection port.
A mold for a resin molded part which defines a cavity with a fixed submold and a movable submold, wherein the fixed submold includes a gate formed to inject a molten resin into the cavity, and a gas injection port formed to inject a gas into the cavity,
- the movable submold is provided with a core pin to be movable in a retreat direction from the cavity, and
- the core pin is arranged to face the gas injection port.
A method of manufacturing a resin molded part, the method comprising:
- injecting a molten resin into a cavity that is defined with a plurality of submolds;
- injecting a gas into the molten resin before the cavity is filled with the molten resin;
- and
- retreating at least a part of the core pin in the cavity from the cavity after the injecting is started and before the cavity is filled with the molten resin.
Dependencies are inferred from the claim text.